Mike Zuckerberg, 24, has been bringing in more experienced leaders as he tries to capitalize on Facebook's massive following. This year, he hired one of Google Inc.'s top executives, Sheryl Sandberg, as Facebook's chief operating officer.

Graham becomes the first chief executive from a company that belongs to the Standard & Poor's 500 stock index to join Facebook's board.

Washington Post's CEO since 1991, Graham runs a stable of media properties that includes Newsweek magazine.

"Don Graham understands how to build and manage an organization for the long term," Zuckerberg said.